19803 Polar Black 4.5 oz.

Took this to my unheated writing desk in January and the flow stayed smooth when cheaper inks had turned to sludge. The polar formula lives up to its name, and the 4.5-ounce bottle means I won't be reordering for a long while.

The 4.5-ounce bottle is a serious amount of ink, so I won't need to restock for a long time. I've been using it in my everyday pen and the water-resistance gives me real peace of mind when I'm caught in the rain on my commute.

Wrote a full page of notes in my pocket notebook during a freezing commute and not a single line smeared or bled through. The 4.5 oz bottle is hefty enough that I won't need a refill for months, and the water-resistance held up when my coffee lid popped off mid-write.